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Volume 12, Number 4—April 2006


Domestic Ducks and H5N1 Influenza Epidemic, Thailand

Thaweesak Songserm*, Rungroj Jam-on*, Numdee Sae-Heng*, Noppadol Meemak†, Diane J. Hulse-Post‡, Katharine Sturm-Ramirez‡, and Robert G. Webster‡Comments to Author 
Author affiliations: *Kasetsart University, Nakornpathom, Thailand; †Western Veterinary Research and Development Center, Rachaburi, Thailand; ‡St. Jude Children's Research Hospital, Memphis, Tennessee, USA

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Table 2

Experimental infection of khaki Campbell ducks with viruses isolated in Thailand, 2004–2005

Virus* Deaths† Illness† Day detectable virus was shed‡
2 4 6 8 10
A/duck/Thailand/144/05 5/10 3/10 10/10 9/9 1/5 0/5 0/5
A/quail/Thailand/551/05 1/10 2/10 8/10 8/10 1/9 0/9 0/9
A/Thailand/MK2/04 2/10 2/10 9/10 10/10 6/8 2/8 2/8
A/duck/Thailand/71.1/04 10/10 10/10 10/10 1/1 –§

*Eight 4-week-old khaki Campbell ducks were injected with 106 50% egg infectious dose of virus by intranasal and intratracheal infection, and 2 contact ducks were introduced 1 day later.
†Total number of deaths or birds showing disease/total number of birds. Birds were observed daily for signs of disease or death.
‡Number of ducks shedding by the trachea or cloacae/total number of ducks remaining alive. Ducks were swabbed every other day beginning on day 2 postinfection.
§All of the ducks in this group died.

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